Reboot Season 4 from Anchor Bay

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I just picked up Reboot 4 - Daemon Rising and My Two Bobs and there is something very weird with the audio, and maybe the video.

when i first start playing the disc, the audio sounds fine, but the further I get into an episode, the slower the audio plays. it still stays syced up to the video, so i am assuming that the video is slowing down too. its like reverse PAL speed up. is this a known problem on Reboot 4 ?

it happens on both sides of the disc and i've tried it in 3 different players which are hooked up to 2 different recievers.